Hi, all. It has been quite a while since my last post, and I apologize. Tank is running well and everyone is mostly happy. Last night I noticed my yellow tang had a pretty bad scratch on it. Today it looks terrible. I don't have a quarantine tank (I can turn a container into one if necessary), but first wanted to get thoughts on what this might be. Fish is eating as normal and swimming as normal. Color on the under belly is a bit whiter than normal is some splotchy sections, and the side is as you see it. Thoughts?